Engineering Materials Practice Set-8

Page 1 of 4

1. The hardness is the property of a material due to which it

Can be rolled or hammered into thin sheets

Breaks with little permanent distortion

Can cut another metal

Can be drawn into wires

2. Argentite is the principal ore or raw material for

Aluminium

Tin

Zinc

Silver

3. Which is false statement about tempering? Tempering is done to

Improve ductility

Improve toughness

Improve machinability

Release stresses

4. Drop forging dies contain carbon of the order of

0.1 to 0.2%

0.6 to 0.7%

0.25 to 0.5%

0.7 to 0.9%

5. Delta metal is an alloy of

Iron, nickel and copper

Copper, zinc and iron

Iron, lead and tin

Iron, aluminium and magnesium

6. Tungsten in high speed steel provides

Wear resistance

Hot hardness

Sharp cutting edge

Toughness

7. Shock resisting steels should have

Low tensile strength

Low wear resistance

Low hardness

Toughness

8. The hardness of steel increases if it contains

Martensite

Pearlite

Cementite

Austenite

9. Weld decay is the phenomenon found with

Nonferrous materials

Mild steel

Stainless steel

Cast iron

10. Nimonic contains __________ percentage of nickel as that of Inconel.

More

Same

Less

None of these

Page 2 of 4

11. Compressive strength of grey cast iron in tonnes/cm is of the order of

1015

710

35

57

12. Steel made from phosphate iron is

Tough

Ductile

Hard

Brittle

13. The machinability of steel is increased by

Sulphur, graphite and aluminium

Phosphorous, lead and sulphur

Silicon and sulphur

Phosphorous and aluminium

14. An example of amorphous material is

Silver

Zinc

Lead

Glass

15. Manganese in steel increases its

Ductility

Tensile strength

Fluidity

Hardness

16. The alloying element which reduces the formation of iron sulphide in steel is

Vanadium

Manganese

Chromium

Nickel

17. Cold rolled steel sheets contain carbon of the following order

0.4%

0.6%

0.2%

0.1%

18. Hardness of upper bainite (acicular structure) is about

RC 65

RC 57

RC 48

RC 80

19. Which of the following is the binding material in cemented carbides?

Vanadium

Iron

Nickel

Cobalt

20. Cupola produces following material

Wrought iron

Pig iron

Malleable iron

Cast iron

Page 3 of 4

21. Perminvar alloy having constant permeability is an alloy of

Iron, zinc and bismuth

Nickel, copper and zinc

Copper, nickel and antimony

Nickel, copper and iron

22. The crystal structure of brass is

Orthorhombic crystalline structure

F.C.C.

B.C.C.

H.C.P.

23. Chromium in steel

Improves wear resistance, cutting ability and toughness

Gives ductility, toughness, tensile strength and anti-corrosion properties

Refines grain size and produces less tendency to carburisation, improves corrosion and heat resistant properties

Improves cutting ability and reduces hardenability

24. Melting point of iron is

1712°C

1601°C

1489°C

1539°C

25. Free cutting steels

Do not exist

Require least cutting force

Contain carbon in free form

Are used where ease in machining is the criterion

26. The presence of sulphur in pig iron makes

The casting unsound

It easily machinable

It hard

It brittle

27. Gun metal contains

70 - 78% copper and rest tin

90% copper and 10% tin

85 - 92% copper and rest tin with little lead and nickel

70% copper and 30% zinc

28. Phosphor bronze contains

0.5% of phosphorous

1% phosphorous

2.5% phosphorous

None of the above

29. Connecting rod is usually made of

High carbon steel

Medium carbon steel

Low carbon steel

Aluminium

30. Preheating is essential in welding

High speed steel

All of the above

All nonferrous materials

Cast iron

Page 4 of 4

31. The alloy used for making electrical resistances and heating elements is

Magnin

Nichrome

Invar

Elinvar

32. Aluminium bronze contains aluminium and copper in the ratio of

60 : 40

40 : 60

50 : 50

10 : 90

33. Beryllium bronze has

(C) Both (A) and (B)

(B) High fatigue limit

(A) High yield point

(D) None of these

34. High carbon steel carries carbon percentage

0.3 to 0.6%

0.1 to 0.3%

0.8 to 1.5%

0.6 to 0.8%

35. Sulphur in cast iron

Aids fusibility and fluidity

Makes the iron soft and easily machinable

Increases hardness and brittleness

Make the iron white and hard

36. Which of the following is used for bearing liner?

Gun metal

Bell metal

Bronze

Babbitt metal

37. Carbon in iron is an example of

Interstitial solid solution

Substitutional solution

Intermetallic compounds

All of the above

38. Corrosion resistance of steel is increased by adding

Nickel and molybdenum

Chromium and nickel

Tungsten and sulphur

Aluminium and zinc

39. Permalloy is a

Nickel and iron alloy having high permeability

None ferrous alloy

Polymer

Kind of stainless steel

40. Bronze contains

70% copper and 30% zinc

70 - 75% copper and rest tin

90% copper and 10% tin

85 - 92% copper and rest tin with little lead and nickel

Engineering Materials Practice Set-8

Related

Leave a ReplyCancel reply

Secured Payments

Protection

Engineering Materials Practice Set-8

Share this Now with Friends:

Related

Leave a ReplyCancel reply

Secured Payments

Protection